My advice - Buy an apple.... once you Mac you won't go back... They just work, no problems.... I had laptop after laptop with windows, the new ones start with problems within 1 month if not before, I have had absolutely no problems with my Mac... and it's cheaper to buy one Mac than to have to replace your windows computer every year or so...

I have not seen or experienced windows 7 yet so cannot say it is or isn't good... try the reformatting solution, (with XP or 7 not vista) that should buy you time to get opinions on windows 7 before investing in a new computer...